BMC/Intel-BMC/linux.git/arch/s390/include/uapi/asm/kvm.h, branch dev

KVM: s390: Allocate and save/restore vector registers

2015-03-06T12:49:33+00:00

Define and allocate space for both the host and guest views of the vector registers for a given vcpu. The 32 vector registers occupy 128 bits each (512 bytes total), but architecturally are paired with 512 additional bytes of reserved space for future expansion. The kvm_sync_regs structs containing the registers are union'ed with 1024 bytes of padding in the common kvm_run struct. The addition of 1024 bytes of new register information clearly exceeds the existing union, so an expansion of that padding is required. When changing environments, we need to appropriately save and restore the vector registers viewed by both the host and guest, into and out of the sync_regs space. The floating point registers overlay the upper half of vector registers 0-15, so there's a bit of data duplication here that needs to be carefully avoided. Signed-off-by: Eric Farman Reviewed-by: Thomas Huth Acked-by: Christian Borntraeger Signed-off-by: Christian Borntraeger

KVM: s390: add cpu model support

2015-02-09T11:44:13+00:00

This patch enables cpu model support in kvm/s390 via the vm attribute interface. During KVM initialization, the host properties cpuid, IBC value and the facility list are stored in the architecture specific cpu model structure. During vcpu setup, these properties are taken to initialize the related SIE state. This mechanism allows to adjust the properties from user space and thus to implement different selectable cpu models. This patch uses the IBC functionality to block instructions that have not been implemented at the requested CPU type and GA level compared to the full host capability. Userspace has to initialize the cpu model before vcpu creation. A cpu model change of running vcpus is not possible. Signed-off-by: Michael Mueller Reviewed-by: Cornelia Huck Reviewed-by: David Hildenbrand Signed-off-by: Christian Borntraeger

KVM: s390/cpacf: Enable/disable protected key functions for kvm guest

2015-01-23T12:25:40+00:00

Created new KVM device attributes for indicating whether the AES and DES/TDES protected key functions are available for programs running on the KVM guest. The attributes are used to set up the controls in the guest SIE block that specify whether programs running on the guest will be given access to the protected key functions available on the s390 hardware. Signed-off-by: Tony Krowiak Reviewed-by: David Hildenbrand Reviewed-by: Cornelia Huck Reviewed-by: Michael Mueller Signed-off-by: Christian Borntraeger [split MSA4/protected key into two patches]

KVM: s390: Provide guest TOD Clock Get/Set Controls

2015-01-23T12:25:40+00:00

Provide controls for setting/getting the guest TOD clock based on the VM attribute interface. Provide TOD and TOD_HIGH vm attributes on s390 for managing guest Time Of Day clock value. TOD_HIGH is presently always set to 0. In the future it will contain a high order expansion of the tod clock value after it overflows the 64-bits of the TOD. Signed-off-by: Jason J. Herne Reviewed-by: David Hildenbrand Signed-off-by: Christian Borntraeger

KVM: s390: clear the pfault queue if user space sets the invalid token

2015-01-23T12:25:36+00:00

We need a way to clear the async pfault queue from user space (e.g. for resets and SIGP SET ARCHITECTURE). This patch simply clears the queue as soon as user space sets the invalid pfault token. The definition of the invalid token is moved to uapi. Signed-off-by: David Hildenbrand Acked-by: Cornelia Huck Signed-off-by: Christian Borntraeger

KVM: s390: Allow userspace to limit guest memory size

2015-01-23T12:25:30+00:00

With commit c6c956b80bdf ("KVM: s390/mm: support gmap page tables with less than 5 levels") we are able to define a limit for the guest memory size. As we round up the guest size in respect to the levels of page tables we get to guest limits of: 2048 MB, 4096 GB, 8192 TB and 16384 PB. We currently limit the guest size to 16 TB, which means we end up creating a page table structure supporting guest sizes up to 8192 TB. This patch introduces an interface that allows userspace to tune this limit. This may bring performance improvements for small guests. Signed-off-by: Dominik Dingel Acked-by: Cornelia Huck Signed-off-by: Christian Borntraeger

KVM: s390: synchronize more registers with kvm_run

2014-08-25T12:35:53+00:00

In order to reduce the number of syscalls when dropping to user space, this patch enables the synchronization of the following "registers" with kvm_run: - ARCH0: CPU timer, clock comparator, TOD programmable register, guest breaking-event register, program parameter - PFAULT: pfault parameters (token, select, compare) The registers are grouped to reduce the overhead when syncing. As this grows the number of sync registers quite a bit, let's move the code synchronizing registers with kvm_run from kvm_arch_vcpu_ioctl_run() into separate helper routines. Signed-off-by: David Hildenbrand Reviewed-by: Cornelia Huck Reviewed-by: Christian Borntraeger Signed-off-by: Christian Borntraeger

KVM: s390: hardware support for guest debugging

2014-04-22T11:24:51+00:00

This patch adds support to debug the guest using the PER facility on s390. Single-stepping, hardware breakpoints and hardware watchpoints are supported. In order to use the PER facility of the guest without it noticing it, the control registers of the guest have to be patched and access to them has to be intercepted(stctl, stctg, lctl, lctlg). All PER program interrupts have to be intercepted and only the relevant PER interrupts for the guest have to be given back. Special care has to be taken about repeated exits on the same hardware breakpoint. The intervention of the host in the guests PER configuration is not fully transparent. PER instruction nullification can not be used by the guest and too many storage alteration events may be reported to the guest (if it is activated for special address ranges only) when the host concurrently debugging it. Signed-off-by: David Hildenbrand Signed-off-by: Christian Borntraeger

KVM: s390: kernel header addition for guest debugging

2014-04-22T11:24:50+00:00

This patch adds the structs to the kernel headers needed to pass information from/to userspace in order to debug a guest on s390 with hardware support. Signed-off-by: David Hildenbrand Signed-off-by: Christian Borntraeger

KVM: s390: Exploiting generic userspace interface for cmma

2014-04-22T11:24:32+00:00

To enable CMMA and to reset its state we use the vm kvm_device ioctls, encapsulating attributes within the KVM_S390_VM_MEM_CTRL group. Signed-off-by: Dominik Dingel Signed-off-by: Christian Borntraeger